7681666 has 16 divisors (see below), whose sum is σ = 11753280. Its totient is φ = 3764880.

The previous prime is 7681657. The next prime is 7681691. The reversal of 7681666 is 6661867.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36301 + ... + 36511.

It is an arithmetic number, because the mean of its divisors is an integer number (734580).

Almost surely, 2^7681666 is an apocalyptic number.

7681666 is a deficient number, since it is larger than the sum of its proper divisors (4071614).

7681666 is a wasteful number, since it uses less digits than its factorization.

7681666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489.

The product of its digits is 72576, while the sum is 40.

The square root of 7681666 is about 2771.5818587947. The cubic root of 7681666 is about 197.3112312668.

The spelling of 7681666 in words is "seven million, six hundred eighty-one thousand, six hundred sixty-six".